不同印模方式对松软牙槽嵴印模精度的比较研究

目的：比较3种不同印模方式对无牙颌松软牙槽嵴印模精度的影响。方法：纳入5名松软牙槽嵴患者，分别采用常规法、缓冲法、开窗法制取印模，灌注终模型。采用口内光学扫描仪获取口内及各个终模型上相应松软牙槽嵴区域的光学印模，导入 Geomagic Qualify 2013软件进行分析，分析口内松软牙槽嵴的光模与各个终模型上相应区域光模的拟合程度，比较3种印模方式的印模精度。结果：5位患者的光学印模拟合图及软件分析所得3D 偏差值（SD、Mean ＋、Mean －）的方差显示，常规法偏差值最大，缓冲法其次，开窗法最小。结论：对于松软牙槽嵴的无牙颌开窗印模方式可提高印模精度。

Impression accuracy of different methods for flabby ridge:A comparison based on 3-dimensional analysis

Objective:To evaluate the impression accuracy of different impression methods for flabby ridge.Methods:5 patients with flabby ridge were included.Conventional technique,perforation technique and window opening technique were performed to make im-pressions and then final models were prepared.The optical models of the flabby ridge area were obtained both in patients'mouths and on the master casts by intraoral optical scanner.Data handling and computations were made by using 3D inspection and metrology soft-ware,regarding SD,Mean +and Mean -,with subsequent analysis.Results:The 3D deviation of the models obtained by conventional technique was the biggest,that obtained by window opening technique was the least.Conclusion:Window opening technique can de-crease the deformation of flabby ridge impression.